Dictionary:

abaft

  (ə-băft') Nautical.

Toward the stern.

Toward the stern from.

[Middle English on baft : on, at; see on + baft, to the rear (from Old English beæftan, behind : be, by, at + æftan, behind).]

adv. in or behind the stern of a ship.

prep. nearer the stern than; behind: the yacht has a shower just abaft the galley.

See the Introduction, Abbreviations and Pronunciation for further details.

Aft of any given point on a ship.

The adverb has one meaning:

Meaning #1: at or near or toward the stern of a ship or tail of an airplane
  Synonyms: aft, astern

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